Road-building apparatus



Filed March 21, 1958 5 Sheets-Sheet l mm mm.

Jan. 2, 194G.

J. H. MOSEL ROAD-BUILDING APPARATUS 's sheets-sheet 2 Filed March 2l,1938 IN V EN TOR c/osep/z H. Mosel.

A TTORNEYS.

Jan. 2, 1940. J, H, MOSEL 2,185,645

` ROAD-BUILDING APPARATUS Filed March 2l, 1938 3 Sheets-Sheet 3 IN1/ENTOR. Josep/7 H. Mose MVM A TTORNEYS.

Patented Jan. 2, 1940 PATENT OFFICE ROAD -BUILDING APPARATUS Joseph H.Mosel, Columbus, Ohio, assignor to The Jaeger Machine Company, Columbus,Ohio, a

corporation of Ohio ApplicationMarch 21, 1938, Serial No. 197,067

13 Claims.

My invention relates to road-building apparatus. It has to do, moreparticularly, with a machine which is particularly suitable foroperating on bituminous mixes or other similar mate- 5 rial and isadapted to compact a layerof such material and to produce a smoothnished surface on such material.

The machine embodying this present invention is a machine oi the generaltype illustrated in the l patent to Joseph H. Mosel, No. 2,054,437,which issued September 15, 1936. However, it is to be understood thatthe various features of this invention are not necessarily limited tothe particular type of machine disclosed in said patent. l One of theobjects of my invention is to provide nishing means adapted to beapplied to a machine of the type indicated which is of such a naturethat it will compact and finish bituminous mixes, especially hot mixes,in an eiicient, 20 economical and accurate manner.

Another object of my invention is to provide finishing means which isparticularly useful for operating on bituminous mixes and which embodiesa screed that is so constructed that it will 25 shear off vandeiiiciently compact the sticky bituminous material.

Another object of my invention is to provide a screed of the typeindicated in the preceding paragraph which is so constructed that it maybe 30 readily adjusted to obtain the desired crown on the surface beingfinished.

Another object of my invention is to provide a screed of th typeindicated having means associated therewith for reciprocating ittransversely to the path of movement of the'machine, the screed and thereciprocating means being so arranged that a minimum amount of powerwill be required for producing the reciprocation.

Another object of my invention is to provide a screed of the typeindicated having means associated therewith for efficiently andeconomically heating it so that it will readily operate on bituminousmixes or other similar materials.

My invention takes the form of a screed arrangement and constructionapplicable to a machine of the general type indicated. A plurality ofscreeds are provided on the machine and arranged in a novel manner. Eachscreed unit is mounted in such a manner that it may be verticallyadjusted. Each screed unit embodies a supporting structure which carriesa vertically disposed forward plate which is adapted to contact with thematerial as the machine advances. A finishing member is supported onthebottom vof the supporting structure and has its forward edgesubstantially flush with said plate. The finishing member may bereciprocated without reciprocating said plate. Thus, the plate serves totake the thrust of a major portion of the material as the machineadvances and prevents the 6 greater portion of this force from-beingapplied to the reciprocating iinishing member. Consequently, the nishingmember may be reciprocated with a minimum amount of power. The iinishingmember preferably includes av plurality of 10 separate hollow shoecastings which are suitably secured thereto. These castings projectforwardly underneath the stationary forward plate and their forwardsurfaces are in alignment with the forward surface of said plate. Thus,the forward side of the castings will contact with the material as themachine advances and since they reciprocate with the finishing member ofthe screed structure, the material will be agitated thereby. However, aspreviously stated, the greater portion of the thrust of the materialwill be taken by the stationary vertically disposed plate.

The separate castings are carried by a exible strip or plate extendingthe length of the screed structure. Means is provided for flexing thisstrip so that the lower finishing surface of the screed structure willhave the desired crown. Since the castings supported on the lowersurface of the screed are in sections, crowning will be facilitated.

As previously indicated, each of the castings is of hollow construction.I provide means for connecting these independent castings together andfor circulating a hot fluid, such as oil, through the various castingsin order to efficiently heat the nishing surface of the screed. Each ofthe castings has a plurality of teeth formed on the lower surfacethereof. These teeth are spaced behind the forward edge of the castingin order to obtain a better compacting action. The teeth are so shapedthat, as the screed advances over the material, they will serve to firstshear off the material and then compact it.

The preferred embodiment of my invention is illustrated in theaccompanying drawings wherein similar characters of reference designatecorresponding parts and wherein:

Figure l is a perspective view of a road-building machine showing myinvention applied thereto.` w

Figure 2 is a plan view of the machine.

Figure 3 is a detail in perspective, partly broken away, showing thescreed structure.

Figure 4 is a transverse section taken through the lower portion of thescreed structure showla ing one of the castings and how Figure 5 is abottom view of a portion of the lower surface of the screed showingmeans for connecting adjacent castings to permit circulation of theheating uid therethrough.

In the drawings, particularly in Figures 1 and 2, I have illustrated amachine of the generaltype disclosed in Patent No. 2,054,437, previouslyreferred to. This machine comprises mainly a runner unit I and aspreading unit 2, the unit 2 being supported on wheels 3. As will beapparent from said patent, the unit 2 is free to move vertically Withoutcausing corresponding vertical movement of the runner unit I, therunners of the unit I merely sliding along the surface. Directly behindthe material receiving hopper of the unit 2 is a screed unit 4. 'I'hisscreed unit is carried by the runner unit. At the rear of the machinesupported by the runner unit ls a pair of auxiliary screeds or blenderscreeds 4a for operating upon material permitted to bleed back past themain screed 4. Vertically adjustable bleeding gate 5 are providedadjacent the ends of the main screed 4 to permit materialto passrearwardly of the main screed in the same manner described in theabove-indicated patent. 'I'he screed structures 4 and 4a are of novelconstruction. Furthermore, they are of practically identical structure.

As illustrated best in Figures 1 and 3, the main screed unit 4 embodiesa main supporting beam 6. This beam 6 is mounted on the runner unit forvertical movement and means similar to that described in said patent maybe provided for supporting it and adjusting it to any desired position..'Ihe beam 6 carries a vertically disposed plate 1 which extendsthroughout the length of the screed unit. This plate serves to form thelower portion of the rear wall of the materialreceiving hopper 2. Thisplate is disposed at the forward side of the screed structure and isadapted to contact with the material as the machine advances. It isadapted to take the thrust of the greater portion of the material thatbears against the screed structure as the machine advances.

A channel beam 8 is suspended from the beam 6 by means of two pairs ofbrackets 9. Each 0i these brackets has its lower end bolted to the beam8 as at 0 and each pair has a roller II supported on its upper end whichoperates on the upper surface of the beam 4. Thus, the beam 8 may bemoved longitudinally relative to the beam 6 which supports it. I providesuitable means for reciprocating the beam 8 relative to the beam 6. Thismeans as illustrated in lFigure 2 may comprise a rod I Ia' which ispivotally connected to the beam 8 as at I2. The opposite end of the rodI Ia may be connected to a crank or other suitable means for imparting areciprocating motion thereto.

The beam 8 has suspended therefrom another channel .beam I3. Thischannel beam is suspended from the beam 8 by means of bolts I4 pivotedto the beam I3 as at I5. The channel beam -|3 has its flanges slotted atlongitudinally spaced points, as indicated at I 6, so that by adjustingthe bolts I4 it may be curved to any suitable crown. 'I'his beam I3 isadapted to carry on its lower surface a plurality of hollow shoes in theform of castings I1 which will be described in detail hereinafter. Thecastings I1 may be bolted to the beam I3 by means of bolts I8.

lAs previously indicated, bleeding gates 5 are disposed at the ends ofthe main screed unit 4. For supporting each of these gates the beam 8 isprovided with an extension 80 at each end thereof. The gate embodies afront plate 10 which is flush with the plate 1 and forms a continuationthereof. 'I'he lower edge of the plate 10 is secured to a channel |30which forms a continuation of the channel I3. One of the shoes issecured to the lower surface of this channel |30. The gate is verticallyadjusted by means of a screw |40 pivotally secured to the channel |30 asat |50. The upper end of the screw passes through a plate I9 which isadapted to slide on the beam unit 6. Guide rods 20 are also associatedwith the gate in the manner indicated. These rods 20 and the screw |40pass upwardly through the beam unit 6, as indicated.

It will be apparent that the unit comprising the channel 8, channel I3and the shoes carried thereby may be reciprocated relative to the unitconsisting of the beam 6 and the plate 1. The plate 1 always remainsstationary during the reciprocation.

Each of the castings I1 is of the shape illustrated best in Figures 3and 4. Each casting is substantially rectangular in cross-section and ofa width approximating the width of the channel |3, as illustrated inFigure 4. A chamber 2| for heating fluid is formed within each shoecasting. An upstanding flange or shoulder 22 is formed on the forwardedge of each casting and is adapted to bear against the forward edge ofthe channel I3. The front surface fiat and is vertically disposed beingsubstantially iiush with the plate 1 which projects downwardly intooverlapping relationship to the channel. be apparent that when memberI3. Thus, it will the shoe-carrying portion of the screed unit isreciprocated, the shoes I1 will be reciprocated and the surfaces 23thereof will move relative to the plate 1. The surfaces 23 of the shoesare adapted to contact with the material as the machine advances. Thus,they will serve to agitate the material adjacent the lower edge of thescreed. However, the stationary plate 1 will take the thrust of thegreater portion of the material. Thus, the shoe carrying portion of thescreed unit may be reciprocated with a minimum of power. As indicated inFigure 3, the joints between the adjacent casting I1 are adapted toalign with the slots I6 in the panel I3 to facilitate crowning.

The lower surface of each shoe is preferably provided with a pluralityof forwardly projecting teeth or cutting edges 24 formed thereon. Theseteeth terminate at a point 25 spaced slightly behind the forward surface23 of the shoe. The edges of the teeth 24 are bevelled as at 26 so thatthey will serve to compact the material as the machine advances. It willbe apparent that the teeth are so arranged that they form a continuousserrated cutting and compacting edge extending throughout the length ofthe screed. A flat final finishing edge or surface 26a is providedbehind the teeth. It will be apparent from Figure 4, that as the machineadvances through the material the excess material will begin to pile upin front of the screed unit. The teeth or cutting edges will shearoilthe material and then by means of the bevelled and serrated surface 26will key up and compact the material. The final nish is obtained fromthe'ilat surface 26a disposed behind the teeth 24. As the machineadvances, the shoe-carrying portion thereof will be 23 of each castingis k reciprocated and this will enhance the shearing and compactingaction.

Each of the separate shoe castings I1 is provided with a chamber 2| forreceiving the fluidv adapted to heat the shoe. In order to connectadjacent shoe castings, 'I provide a number of U-shaped tubes 21 of thetype indicated in Figure 5. One end of this tube is threaded into a boss28 formed adjacent the end of one of the shoes while the opposite endthereof is threaded into a similar boss formed on the adjacent end ofthe adjacent shoe. It will be apparent that the shoe sections may becaused to assume the proper crown without disturbing the connectionbetween the adjacent shoes.

Eachrof thev screed units 4a is lsubstantially identical with the screedunit 4. Each unit has a stationary plate 1a which has one end supfported on screws 29 mounted on the runner unit and provided forvertically adjusting the end of the screed unit 4a. The opposite end ofeach of these units is supported on a support 30 extende ing rearwardlyfrom each runner and is adapted to be vertically adjusted by means of ascrew 3l. The stationary plate 1a carries a beam 6a. Reciprocablysuspended from this beam Ba by means of brackets and roller units 9a isa channel I3a. This channel carries shoes I1. The reciprocating portionof this screed unit is substantially identical with that of the unit 4and further description is not deemed necessary. Any suitable means suchas that indicated generally by the numeral I Ia may be provided forreciprocating the shoe-carrying portion of the screed. Thrust-receivingrollers 32 supported on brackets depending from the beam 6a and bearingagainst the rear surface of the channel I3a may be provided. l

The means for supplying and circulating the heating fluidI through thevarious shoe castings may be of any suitable type. It preferablycomprises a pump 33, a heating chamber 34 and a tank 35 for air underpressure. The tank 35 is adapted to supply a burner unit 36 with air forcombustion. These units are connected to the various screed units bysuitable flexible conduits.

It will be apparent from the above description that I have providedfinishing means adapted to be applied to a machine of the type indicatedhaving many advantageous features. The auxiliary screeds as well as themain screed are reciprocated in order to enhance the finishing action.Each screed is of such a nature that it will contact and finishbituminous mixesespe cially hot mixes, in an efcient, economical andaccurate manner. Each screed which I have provided has a comparativelyfiat lower finishing surface which is provided with a serrated andbevelled continuous edge for shearing and compacting the material as themachine advances and the screed reciprocates. The screed is of suchstructure that its crown may be readily changed. Furthermore, the screedis so arranged that the shoe-carrying portion may be reciprocated with aminimum amount of power.

Having thus described my invention, what I claim is:

1. In apparatus for finishing a road surface, a reciprocating finishingmember having a substantially fiat finishing surface, said finishingsurface having a serrated edge formed on the bottom thereof forcontacting with the material as the apparatus advances, said serratededge being disposed behind the forward edge of said finishing member.

2. In apparatus for finishing a road surface. a finishing member havinga substantially fiat finishing surface and disposed transversely of thepath loi movement of the apparatus, said nishing surface having asubstantially continuous serrated edge formed thereon for contactingwith the material as the apparatus advances, means for reciprocatingsaid finishing surface transversely of the path of movement of theapparatus as the apparatus advances, said edge being bevelledso as' tocompact the material as the apparatus advances and the finishing surfacereciprocates, said serratededge being disposed behind the forward edgeof said finishing member.

3. In apparatus for finishing a road surface, a screed unit having asubstantially fiat finishing member disposed at theA bottom thereof, astationary vertically disposed plate supported on said screed unit andadapted to take the thrust of' the greater portion of the materialbearing against saidl screed unit as the apparatus advances, saidfinishing member having a serrated edge formed thereon at a point behindthe for- Ward edge of said finishing member, the forward edge of saidfinishing member beirg disposed below the edge of said plate andsubstantially iiush therewith, and means for reciprocating saidfinishing member without reciprocating said plate.

4. In apparatus for finishing a road surface, a screed structurecomprising a supporting structure, said supporting structure beingmounted on the apparatus in such a manner that it may be verticallyadjusted, said supporting structure carrying a vertically disposed plateadapted to receive the thrust of the greater portion of the materialwhich bears against the screed structure as the apparatus advances, afinishing member supported on said supporting structure forreciprocating movement relative thereto, said finishing member having afiat forward edge adapted to engage the material as the apparatusadvances, said fiat edge being disposed below the edge of saidstationary plate and substantially flush therewith, and means forreciprocating said finishing member relative to 'said plate. l

5. A screed unit comprising a support adapted to be reciprocated, afinishing shoe secured to said support, said shoe comprising asubstantially flat lower surface having a continuous serrated andbevelled edge formed thereonwhich is spaced from the forward edge ofsaid shoe, said shoe also having a substantially fiat surface formedthereon behind the serrated edge.

6. A screed unit comprising a longitudinally extending support, meansfor bowing said support to produce a predetermined crown, a plurality offinishing shoes secured to said support, said shoes being mounted onsaid support adjacent each other but being independent of each other topermit crowning lof said support, each of said shoes comprising asubstantially at lower surface having a continuous serrated and bevellededge formed thereon which is spaced from theforward edge of said shoe.

7. A screed unit comprising a longitudinally extending support, meansfor bowing said support to produce a predetermined crown, a plurality offinishing shoes secured to said support, said shoes being mounted onsaid support adjacent each other but being independent of each other topermit crowning of said support, each of said shoes having a chamberformed therein for receiving heating fiuid, and means for connecting theadjacent shoes together so that they .rality of longitudinally extendingrunners, a

main screed carried by the runners and extending transversely of thepath of movement of the machine, means for 'reciprocating said screedtransversely of the path of movement of the machine, means forpermitting material to bleed back past said screed, an auxiliary screeddisposed behind said main screed, said auxiliary screed being carried bythe runner and being disposed at an angle thereto, and means forreciprocatingA said auxiliary screed longitudinally of its own axis.

9. In a machine of the type described, a plurality of longitudinallyextending runners, a main screed carried by the runners and extendingtransversely of the path of movement of the machine, means forreciprocating said screed longitudinally of its own axis, an auxiliaryscreed disposed behind said main screed transversely of the path ofmovement of the machine, and means for reciprocating said auxiliaryscreed longitudinally of its own axis.

10. In a machine of the type described, a plurality of longitudinallyextending runners, a main screed carried by the runners and extendingtransversely of the path of movement of the machine, an auxiliary screeddisposed behind said main screed and extending transversely of the pathof movement of the machine, and means for reciprocating said auxiliaryscreed longitudinally of its own axis.

11.- In a machine of the type described a plu-y rality of longitudinallyextending runners, a main screed carried by said runners and extendingtransversely of the path of movement of the machine, means forpermitting material to 'upon the material that bleeds bleed back pastsaid screed, an auxiliary screed disposed behind said main screed foroperating back past the main screed, said auxiliary screed beingdisposed at an angle'to said runners, and means for reciprocating saidauxiliary screed longitudinally of its own axis.

12. In apparatus for finishing a road surface.' a hopper having a rearwall, a screed unit .dis-

posed directly behind said rear wall, said screed unit embodying asupporting structure which is vertically adjustable relative to saidrear wall, said screed unit including a vertically disposed platesecured t'o said supporting structure andl being vertically movabletherewith, said screed unit also including a substantially at finishingmember disposed at the bottom thereof, said iinishing member beingmounted on said supporting structure in such a manner that it may bereciprocated thereon longitudinally of itself, said finishing memberhaving its forward edge disposed below the edge of said plate andsubstantially flush therewith, and means for reciprocating saidfinishing member without reciprocating said plate.

13. In apparatus for finishing a road surface,

a screed unit, said screed unit embodying a main supporting structure, avertically disposed plate secured to the front side of said supportingstructure, a support carried by said first support in such a manner thatit may be vreciprocated relative thereto, a substantially flat iinishingmember adjustably carried by said last-named support, said finishingmember having its forward edge disposed below the edge of said plate andsubstantially ush therewith, said plate being adapted to take thelthrust of the greater portion of the material bearing against saidscreed unit.

JOSEPH H. MOSEL.

